A pedestrian walks by a sign celebrating 20 years of The Bill & Melinda Gates Foundation, which was launched in 2000, at the foundation's Discovery Center in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A sign commemorating 20 years of the Bill & Melinda Gates Foundation, which was launched in the year 2000, is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A welcome plaque is pictured outside the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Bill & Melinda Gates Foundation is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A person passes by on a scooter in front of the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Space Needle is reflected in the windows of the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Space Needle rises over the Bill & Melinda Gates Foundation campus in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Space Needle is reflected in a building at the Bill & Melinda Gates Foundation campus in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson

Demonstrators hold placards with the images of Bill Gates and German politicians during a rally against the government's restrictions following the coronavirus disease (COVID-19) outbreak, in Leipzig, Germany, November 7, 2020. The placards read "Guilty". REUTERS/Kai Pfaffenbach

A car sits among the remains of Bill Kesselring's,72, home in the aftermath of the Beachie Creek Fire near Gates, Oregon, U.S., September 18, 2020. REUTERS/Shannon Stapleton

Bill Kesselring and his wife Dee stand for a portrait by the remains of their home in the aftermath of the Beachie Creek Fire near Gates, Oregon, U.S., September 18, 2020. REUTERS/Shannon Stapleton

Bill Kesselring, 72, walks by the remains of his home in the aftermath of the Beachie Creek Fire near Gates, Oregon, U.S., September 18, 2020. REUTERS/Shannon Stapleton

A statue of Bill Shankly is seen through a padlocked gate outside Anfield, home of Liverpool FC, on the day the Premier League season was due to finish before being postponed following the outbreak of the coronavirus disease (COVID-19), Liverpool, Britain, May 17, 2020. REUTERS/Phil Noble

Effigies depicting German Chancellor Angela Merkel and Bill Gates are seen during a protest against the government's restrictions following the coronavirus disease (COVID-19) outbreak, at Cannstatter Wasen area in Stuttgart, Germany, May 16, 2020. REUTERS/Kai Pfaffenbach

A protester holds up a placard with a message against Bill Gates, during a demonstration against the lockdown imposed to slow down the spread of the coronavirus disease (COVID-19), in Berlin, Germany April 25, 2020. REUTERS/Christian Mang

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates in action during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates in action during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates in action during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Trevor Noah in action during the doubles match with Spain's Rafael Nadal against Switzerland's Roger Federer and Bill Gates REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Bill Gates in action during the doubles match with Switzerland's Roger Federer against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates in action during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Bill Gates in action during the doubles match with Switzerland's Roger Federer against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 General view during the doubles match between Switzerland's Roger Federer and Bill Gates against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Spain's Rafael Nadal and Trevor Noah react during the doubles match against Switzerland's Roger Federer and Bill Gates REUTERS/Mike Hutchings

Tennis - "The Match In Africa" Exhibition Match - Cape Town Stadium, Cape Town, South Africa - February 7, 2020 Switzerland's Roger Federer and Bill Gates in action during the doubles match against Spain's Rafael Nadal and Trevor Noah REUTERS/Mike Hutchings

Pedestrians walk in front of the gates of the National Congress as lawmakers meet to debate and vote on an emergency economic bill proposed by new President Alberto Fernandez, in Buenos Aires, Argentina December 20, 2019. REUTERS/Agustin Marcarian

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks as World Bank Group President David R. Malpass (L), Amazon-based indigenous leader Tuntiak Katan and Bangladesh's Prime Minister Sheikh Hasina (R) look on during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

World Bank Group President David R. Malpass speaks as Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, looks on during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks as World Bank Group President, David R. Malpass and Amazon-based indigenous leader Tuntiak Katan look on during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks as Amazon-based indigenous leader Tuntiak Katan listens during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks as Bangladesh's Prime Minister Sheikh Hasina and Amazon-based indigenous leader Tuntiak Katan look on during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Carlo Allegri

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, speaks as Bangladesh's Prime Minister Sheikh Hasina and Amazon-based indigenous leader Tuntiak Katan look on during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Carlo Allegri

Bangladesh's Prime Minister Sheikh Hasina (R) speaks next to Bills Gates and Amazon-based indigenous leader Tuntiak Katan during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Bill Gates, Trustee and Co-Chair of the Global Commission on Adaptation, arrives to speak during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Lucas Jackson

Airport security guards hold the gate to stop the anti-extradition bill protesters from entering the Hong Kong Airport, in Hong Kong, China, September 1, 2019. REUTERS/Anushree Fadnavis

Airport security guards hold the gate to stop the anti-extradition bill protesters from entering the Hong Kong Airport, in Hong Kong, China, September 1, 2019. REUTERS/Anushree Fadnavis

Airport security guards hold the gate to stop the anti-extradition bill protesters from entering the Hong Kong Airport, in Hong Kong, China, September 1, 2019. REUTERS/Anushree Fadnavis

Anti-extradition bill protesters gather outside the gate of the Hong Kong Airport, in Hong Kong, China, September 1, 2019.REUTERS/Anushree Fadnavis

Anti-extradition bill protesters gather outside the gate of the Hong Kong Airport, in Hong Kong, China, September 1, 2019. REUTERS/Anushree Fadnavis

Airport security guards hold the gate to stop the anti-extradition bill protesters from entering the Hong Kong Airport, in Hong Kong, China September 1, 2019. REUTERS/Tyrone Siu

Anti-extradition bill protesters gather outside the gate of the Hong Kong Airport, in Hong Kong, China September 1, 2019. REUTERS/Tyrone Siu

Riot police officers stand guard in front of the main gate of Mong Kok police station during "Reclaim Hung Hom and To Kwa Wan, Restore Tranquility to Our Homeland" demonstration against the extradition bill in To Kwa Wan neighborhood, Hong Kong, China August 17, 2019. REUTERS/Kim Hong-Ji

Anti-extradition bill protesters use trolleys to stop passengers from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu

Anti-extradition bill protesters use trolleys to stop passengers from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu

Anti-extradition bill protesters use trolleys to stop passengers from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu

Anti-extradition bill protesters use trolleys to stop passengers from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu TPX IMAGES OF THE DAY

Anti-extradition bill protesters try to stop passengers from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu

An anti-extradition bill protester offers an apology to passengers blocked from entering the security gates during a mass demonstration after a woman was shot in the eye, at the Hong Kong international airport, in Hong Kong China August 13, 2019. REUTERS/Tyrone Siu